SIP Phones

QjSimple: A cross-plattform GPL SIP client with support for presence, instant messaging, TLS and SRTP. Aimed for developers with a dedicated DEBUG window and configuration support.http://www.ipcom.at/index.php?id=560

x-lite, x-pro: A SIP client for Windows; Mac OS and Windows CE, http://www.xten.com/index.php?menu=download. A really nice SIP UA with a lot of features. The light version is free and really rocks, the pro version not. Supports multiple proxies.

MiniSIP: An open source SIP user agent for Linux which runs on PDAs. It is based on several libraries, including libmsip, a C++ SIP stack. Homepage: http://www.minisip.org/index.html.

sipXphone: Part of pingtel's open source releases for VoIP. License: LGPL; Homepage: sipfoundry.org. This softphone also requires lots of other libraries from the sipX... software at sipfoundry.org.

SIPPS: SIP softphone with answering machine and a lot of features. They have also integrated support for nikotel.com for SIP-PSTN termination.http://www.sippstar.com/. A Demo for testing is available. The configuration is a bit weird (what's the difference between a proxy and a redirect server?).

MSN Messenger: Microsofts Messenger, Version 4.6 allows also connections to other SIP servers than microsofts one. Nice design, works very well. Can be used with the SIP service of iptel.org. Homepage: http://messenger.microsoft.com; local download of Version 4.6 for Windows NT (2000).

MSN Messenger: Microsofts Messenger, Version 4.7 allows also connections to other SIP servers than microsofts one. Nice design, works very well. Can be used with the SIP service of iptel.org. Homepage: http://messenger.microsoft.com; local download of Version 4.7 for Windows XP.

PhoneGaim: The multiplatform, multiprotocol IM client GAIM was extended with VoIP (linphone based) by linspire/sipphone. It's open source! At the moment it's in a beta status and supports only sipphone.com as SIP proxy, but as the source code is also available, you can change this by yourself ;-). Homepage: http://www.phonegaim.com/.

SFLphone: A multiplatform, open source SIP user agent. It is based on several libraries: cc++, ccRTP, osip2+eXosip. Open Source. Homepage: http://www.sflphone.org.

Zfone: Zfone is not really a SIP phone, but an extension to any SIP phone. It implements the ZRTP protocol for secure media streams. This is done by intercepting the media stream from the SIP phone and adding the ZRTP extension. Homepage:http://www.philzimmermann.com/EN/zfone/index.html.

Zoiper: A SIP/IAX2 softphone. It's using reciprocate as sip stack and has an in house developped iax2 stack - both function at the same time and you could do a conference between them. Supports Windows. Mac and linux versions are planned. The "Free" version is free to use. Homepage:http://www.zoiper.com/.

Lynxphone: A commercial multiplattform SIP client; based on resiprocate STIP stack; A free version is available at http://www.bitlynx.com/lynxphone.php. Offers nearly the same settings as eyebeam (as based on the same stack). The german translations are really funny! The user interface is crap.

VO2IP: VoVoIP (means voice over voice over IP) is a proof of concept implementation which hides a G.729 encoded audio stream into a G.711 encoded fake audio stream using G.711's least significant bit. It is GPL licensed, based on pjmedia (see SIP stacks) and runs under Windows. Homepage: http://voipcc.gtisc.gatech.edu/.